Station-indicator



(No Model.) 2 ShetsS heet 1.

' A. .0. ALLYN. STATION INDICATOR.

1%. 525,176;- Patented Aug. 28, 1894.

y STREET AND STATION IN lJl EATU WITNESSES. INVENTEIRI 2M 1 i TNE NORRISPErzRs cu PHoro-uT w wnsumcmn. u. c.

2 Sheets-Sheet 2.

(N0 Model.)

A. G. ALLYN. STATION INDICATOR.

No. 525,176. Patented Aug. 28,1894.

\MTNESSESI 'INVENTDRI uunms mus cQ NoToumou Asnlxm n UNITED STATESPATENT OFFICE.

ATHEAN C. ALLYN, OF BOSTON,'MASSACHUSETTS.

STATION-INDICATOR.

SPECIFICATION forming part of Letterslatent No. 525,176, dated August28, 1894.

Application filed 0mm 30, 1893.

To all whom it may concern/ Be it known that I, ATHEAN C. ALLYN, of

I and useful Improvements in Station-Indicators, of which the followingis a specification.

The object of the present invention is to provide means for positivelyengagingaroller or pulley and an apron, curtain or belt, whereby a fixedrelation is established. The arrangementis designed for usein street andstation indicators which employ a curtain hearing legends, and rollersone of which by its rotation moves the curtain so as to display thelegends successively. In an appliance of this character, it is of greatimportance that a positive relation be established between thedriving-roller and the curtain, otherwise the inscriptions on the latterwillnot be properly displayed. While the invention is designed to supplythis desideratum in this class of devices, yet it is not limited to suchdevices, and may be employed in many other connections.

Of the accompanying drawings, which illustrate an embodiment of theinvention: Figure 1 shows a front elevation of a street and stationindicator. Fig. 2 shows a side elevation of the parts which embody theinvention. Fig. 3 shows an end view of the same.

Fig. 4 shows a longitudinal section. Figs. 5 and 6 show detail views ofa cam.

The same letters of reference indicate the same parts in all thefigures.

In the drawings: the-letter a designates the curtain of the indicator,which bears the legends, and b designates the driving-roller over whichsaid curtain passes.

In order to establish an unvarying relation between the curtain androller, it is necessary to prevent any lost motion between them, and tothis end my invention provides means for clamping the curtain to theroller as it is carried around thereby. The means here shown foraccomplishing this design consists of a series of nippers c, pivoted tosupport 0', on a metallic sleeve 0 fastened on one end of the roller b,said supports being within the periphery of the sleeve, and the nippersbeing so formed that, when turned in one direction on their pivots,their engaging portions Serial No. 489,512. (No model.)

are brought upon the curtain where it is in contact with the roller;and, when turned in the opposite direction, they are wholly out of thepath of the curtain. The nippers are'normally thrown to this latter oroutward position by springs (1, attached at one end to the nippers onthe inner side of their pivots, and at the other end to theinner wall ofthe sleeve 0 The outward position of anipperis maintained until therotation of the roller brings it to that part of the curtain which liesflat against the roller, and then the nipper is brought over upon thecurtainand clamps it to the roller, and does not release its hold untilit arrives where the curtain leaves the roller. The means employed forthus applying the nippers consists in a stationary cam e, affixed to asuitable support by means of a flange e, and formed with a raisedengaging surface c of sufficient extent to be engaged simultaneously bytwo of the nippers, which are formed with outward-extending flanges e toengage the cam. Under rotation of the roller, when the nippers are atthe low part of the cam, the springs hold them. in their outwardposition, so that they do not interfere with either stretch of thecurtain, and when the nippers arrive at the point where the curtainengages the roller, they encounter the high part of the cam and areapplied thereby, two nippers being at all times in action.

It will be seen that the above arrangement establishes a positiveengagement between the curtain and roller.

The cam e tapers in thickness at each end of the acting section, e andmerges into a partly circular V-shapedblade, 6 so that the flanges, e ofthe nippers will ride easilyinto and off from said surface, c and willtake over and behind the blade a so as to be guided thereby. Thus thenippers are at all times properly controlled, being held to the cam andblade by the springs, their outward movement being limited by the blade.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

The combination with a roller and curtain of nippers pivoted to theroller and adapted to extend over the curtain and clamp the same againstthe roller, said nippers having In testimony whereof I have signed myflanges projecting on the outer sides of their name to thisspecification, in the presence of 10 pivots, a fixed cam having asection which 00- two subscribing witnesses, this 25th day of Ocactswith the said flanges to move the nippers tober, A. D. 1893.

against the roller and a tapered blade over ATHEAN O. ALLYN. which theflanges may take when the nippers Witnesses: move away from the roller,and springs impel- F. PARKER DAVIS,

ling the nippers away from the rollers. ARTHUR W. CROSSLEY.

